/*
 * The MIT License
 * 
 * Copyright (c) 2011 Takahiro Hashimoto
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.taobao.top.link.embedded.websocket.handler;

import java.nio.ByteBuffer;

import com.taobao.top.link.embedded.websocket.WebSocket;
import com.taobao.top.link.embedded.websocket.exception.WebSocketException;
import com.taobao.top.link.embedded.websocket.frame.Frame;

/**
 * The Class WebSocketPipeline.
 *
 * @author Takahiro Hashimoto
 */
public class WebSocketPipeline {

  /** The start chain. */
  private StreamHandlerChain startChain;

  /** The last chain. */
  private StreamHandlerChain lastChain;

  /**
   * Send handshake upstream.
   *
   * @param ws
   *          the ws
   * @param buffer
   *          the buffer
   * @throws com.taobao.top.link.embedded.websocket.exception.WebSocketException
   *           the web socket exception
   */
  public void sendHandshakeUpstream(WebSocket ws, ByteBuffer buffer) throws WebSocketException {
    lastChain.nextHandshakeUpstreamHandler(ws, buffer);
  }

  /**
   * Send handshake downstream.
   *
   * @param ws
   *          the ws
   * @param buffer
   *          the buffer
   * @throws com.taobao.top.link.embedded.websocket.exception.WebSocketException
   *           the web socket exception
   */
  public void sendHandshakeDownstream(WebSocket ws, ByteBuffer buffer) throws WebSocketException {
    startChain.nextHandshakeDownstreamHandler(ws, buffer);
  }

  /**
   * Send upstream.
   *
   * @param ws
   *          the ws
   * @param buffer
   *          the buffer
   * @param frame
   *          the frame
   * @throws WebSocketException
   *           the web socket exception
   */
  public void sendUpstream(WebSocket ws, ByteBuffer buffer, Frame frame) throws WebSocketException {
    lastChain.nextUpstreamHandler(ws, buffer, frame);
  }

  /**
   * Send downstream.
   *
   * @param ws
   *          the ws
   * @param buffer
   *          the buffer
   * @param frame
   *          the frame
   * @throws WebSocketException
   *           the web socket exception
   */
  public void sendDownstream(WebSocket ws, ByteBuffer buffer, Frame frame) throws WebSocketException {
    startChain.nextDownstreamHandler(ws, buffer, frame);
  }

  /**
   * Adds the stream handler.
   *
   * @param handler
   *          the handler
   */
  public void addStreamHandler(StreamHandler handler) {
    StreamHandlerChain c = new StreamHandlerChain(handler);
    if (startChain == null) {
      startChain = c;
      lastChain = c;
    } else {
      lastChain.add(c);
      lastChain = c;
    }
  }

  /*
   * (non-Javadoc)
   * 
   * @see java.lang.Object#finalize()
   */
  @Override
  protected void finalize() throws Throwable {
    startChain.clear();
    super.finalize();
  }
}
